Check mechanism



April 23, 1940. E. DAVIS CHECK MECHANISM Filed sept. 10, 1937 3 Sheets-Sheet 1 H INVENTOR. 115 5 D vls M A TTORNEYS.

April 23, 1940.

E. DAVIS CHECK MECHANISM Filed Sept. 1.0, 1937 3 Sheets-Sheet 2 1: ERNEST h (Z/m DAVIS A ril 23, 1940. E. DAVIS 2,197,925

CHECK MECHANISM Filed Sept. 10, 1957 3 Shets-Sheet 3' II\'I-'E.Y\'TOR.' BY ERNEST DAVIS zigwfi a.

ATTORN YS.

7 Patented Apr.-23, 1940 QoHEo MEGI I ANTSM Ernest Davis; Syracuse, NQ Y., assignor .to The Prosperity Company corporation of New York Application September 10, 1937, Serial Nonsense T 6 Claims.

- end of its closing movement and as it approaches the end of its opening movement, and has for its general object a checking mechanism of thevane type involving a reversely movable piston'member -or vane having means for adjusting the checking. efiect, and if desirable, adifierent checking effect at the end of one movement of the machine, as for instance, the closing movement than at the end of its other movement, as the opening move ment. ,7 "i

It also has for its object a particularly simple and compact construction of a hydraulic checking device.

Other objects appear throughout the tion. Y

The invention consists. in the novel features and in the combinations and constructions hereinafter set forth and claimed. v. I In describing this invention, referenceis had to specificaof the casing and the cover of the pressure cham- ,ber removed. e Figure 4 is a sectional view aken approximately on line 44, Figure v I Figure 5 is a sectional viewtaken on line 5 5, Figure 4. no 3 Figures 6 and '7 are views similar to Figures 3 and 4 illustrating modified form of the adjusting member. v

Y This check mechanism comprises, generally, a casing formed with a reservoir for a'hydraulic liquid, a piston chamber located to receive the liquid from the reservoir and to discharge thereint'o, a piston member or vane having a back and forth "movement, and preferably'an oscillating movement in the piston chamber, the chamber having outlets into the reservoir through which the liquid is passed under the action of the piston or vane; and means to adjust the outlets to vary the checkingeffect. In Figures 3 and 4,

the outlets are arranged to be passed by the pis-o top or vane in its movement, during the end M periods of its stroke, and the adjusting nieans theaccompanying drawings in, which .like char-- (01. me ns operable-to closeone or more of a series oi out,- lets to vary the checkingaction. l v The checking-mechanism shown inFigures 3 and 4 comprises two series-of outlets arranged on opposite sidesof theposition occupied by the pis, ton or vane; when i-n the central orintermediate period 01? its stroke, together with means individiual-to each series for closing or cutting out one or v more of the outlets of each series.

The check mechanism also comprises an inter- 10 mediate port-operating to 'reduce the resistance 7 on the vane, asthe checked machine is passing through the intermediate part of its opening and, closing movements.

,l designates the casing formed with an oil reservoir 2. 3 designates apiston chamber 10- cated in the-oil reservoir 2, the piston chamber being here shown as cylindrical and arranged with its axis coincident with the axis of the res- -ervoir, which is also cylindrical, the piston chamg0 ber being spaced apart from the cylindrical wall forming an annular oil passage. The casing is also-i ormed with an upper portion 6 forming a gear box" The front wall of the casing is a removable cover this cover being secured in position, as by screws Ill. The end of the piston: chamber '3 opposed to the cover is closed by-a plate H which is spaced from the cover and is secured in position, as by screws I2. The space closed by the casing cover is a gear box. l3 designates, a piston member, this being shown as an oscillating piston; vane or blade, mounted on-. a'."shaft I4, journalled'atone' end at I5 in the rear 'wall of the reservoir 2', this shaft I4 extending through theplate [Land being 7 journalled at its front .endin a cup or closed bearing It in the cover 9., '[ll is'a' gear fixed orkey'ed ona shaft I 8 'journalled in theupper portion 6 of the casing l and inside'the"casing. 201s agear meshing with. the l gear a IT an m nted and 'pir'med'onthe' shaft 1 4 the piston moves from the *full line position,

shown 'in'Fi g'ureB, into the "dotted line position, and during the opening movement of the macl1ine,:'froin' the'dottedline positionjto the full line position? 'lhepas n ii fi d 5 to ale vi'n above j I the piston chamber 3 through a suitable filler in the lower portion of the piston chamber and arranged to be passed by the piston when the piston is passing through theintermediate period of its stroke, from the full line position (Figure 3) to the dotted line position, and vice versa. The port 24 is provided with tapering walls 24 at the ends thereofwith respect to the direction of movement of the piston vane to avoid a sudden checking effect, as the piston vane is passing the port 26 in either direction.

The piston chamber 3 is provided with a suitable partition or abutment 25 located diametrically opposite the port 24.

26 and 27 (Figures 3 and 4) designate two series of outlet ports extending through the rear Wallof the piston chamber '3 and opening into the casing through passages 'or bores 28, 29 in the rear end wall of the piston chamber, one series, as 26, serving to control the outlet of the oil during the end of the closing movement of the machine to which the device is connected, and while the piston is moving toward the end of itsstroke in one direction, and the other series 2'? serving to check the flow'of oil under the action of the piston during the end of the stroke of the piston in the opposite direction, during the opening movement of the machine. The outlets of each series 26, 21 are so arranged'that they are passed progressively by the piston in its movement in one direction or the other.

The means for varying the checking efiect opcrates to open or close one or more of the ports 25, 21 of each series, there being one adjusting means for'each series. The adjusting means consists of a movable plunger or valve 30 or 3! mounted in the passage or bore 28 or 29 and adjustable progressively across the ports 25, 21, each'valve 30, 3! having a suitable stem 32 or 33 having a knob or handle 34 or 35 at its outer end. It is held in adjusted position by suitable set nuts 36, 31. Obviously, by moving the plunger-or valve 30 or 3! outwardly to its full extent, all the ports 26 or 21 will be opened and by moving it inwardly, one or more-ofthe ports 26 or 21 will be closed. Also, the valves or plungers 38, 3| may be adjusted to'give a different checking eifec't, if desired, during the closing movement of the machine from that during the opening movement.

The casing l is secured to the frame F of the machine to which the checking device is applied inanysuitable manner, as by screws 40, 4|.

In operation, during the closing of the ma chine to which the checkingmechanism is applied, the shaft I8 is actuated by the arm 21 and the motion thereof transmitted by the gears ll, 20 to the shaft [4 and the piston member l3, moving the piston member from the full line position (Figure 3) to the .dotted line position. During the first half of this movement, the 'oil is pressed in front of the piston out throughthe port 24 with very little resistance. After the piston I3 passes the port 24, the only outlet for the oil is throughfthe ports 26. As these ports are passed, one by one, the resistance, and hence the checking effect, gradually increases, The

amount of resistance may be regulated by rusting the valve .r m g l @n h e r eqes of the piston, with respect tothe direction of movement, is compressed against the abutment 25, and hence is forced out through the ports 26 or 2?. During the opening of the machine, the piston is actuatedby the arm 2| through gears 17 and 20 in the reverse direction from the dotted line position (Figure 3) toward the full line position, and the oil first passed freely out through the port24, until the piston passes the port 24, when the checking effect is controlled by the ports 27. The oil displaced by the piston ton through the port 24, after the port has been passedby the piston.

chamber 3 through a work hole 53 in the rear Wall of the casing I. Each ball is held off its seat 54 by a member, as a screw 55, threading through a plug 56 closing the work hole. The screw is operable to locate the ball or valve various distances off its seat and thus vary the checking effect. Obviously, the balls may be adjusted differently to effect a diifer'ent checking effect during the closing of the machine from during the opening. The operation of the machine is the same as that described, with the exception that the checking effect is not varied by the piston vane passing the outlets successively. Owing to the construction of the casing with the piston chamber submerged in the oil reservoir and theshaft l i'mou'nted in the cup bearing in the cover 9, and the shaft I?! located out of the oil reservoir, and hence out of the pressure area of the piston member, the oil can not leak out of the casing along shafts and through bearings.

What I claim is:

1. In a hydraulic check mechanism, a casing formed with a reservoir for a checking liquid, a

piston chamber located to receive the liquid from the reservoir, a piston having a back and forth movement in the chamber, the chamber having 'a pert opening into the reservoir midway between the positions occupied by the piston, when at the ends of its throw, and located to be passed i by the piston, the chamber also having-a series of outlets into the reservoir on opposite sides of said port, the outlets of each series being arranged progressively with respect to the movemerit of the-piston, means operable at will to open and close'theoutlets of each series more or less, and thereby vary the progressive checking effect, and means for, connection to a moving part for actuating the piston.

2. In a hydraulic check mechanism, a casing connectien to a moving part for actuating the bisten.

l3 through'the port 24 flows in behind the pis- 3. In a check for machines having an opening and a closing movement, a casing formed with a cylindrical reservoir for a checking liquid,

a cylindrical piston chamber located in the reser'voir and spaced apart from the cylindrical wall thereof, a piston having an oscillating movement mounted in the chamber on an axis coaxial with said chamber, the chamber having two series of outlets opening through an end Wall thereof into the reservoir and located on opposite sides of the piston when in the intermediate period of its throw, the piston chamber also having a port opening into the reservoir and located to be passed by the piston when in the intermediate period of its movement and between said two series of outlets, an abutment located in the portion of the piston chamber diametrically opposite said port, and means for connection to a moving 1 part of the machine for actuating the piston.

4. In a check mechanism, a casing formed with a reservoir for a checking liquid, a piston chamber located to receive the liquid from the reservoir, a piston having a back and forth movement in the chamber, the chamber having a port opening into the reservoir midway between the positions occupied by the piston whenrat the ends of its throw and located to be passed by the piston, the chamber also having outlets into the reservoir on opposite sides of said port and opening into the chamber along lines extending in opposite directions away from said port with respect to the movement of the piston toeffect a progressive checking, and means operable at will to open and close the outlets more or less to vary the progressive checking efiect.

5. In a hydraulic check mechanism, a casing formed with a cylindrical reservoir for a checking liquid, a cylindrical piston chamber located in the reservoir and spaced from the cylindrical wall thereof, a piston having an oscillating movement mounted in the chamber on an axis coaxial with said chamber, the chamber having a port opening into the reservoir and located to be passed by the piston when in the intermediate period of its movement, the chamber being also formed with outlets inthe portion thereof on opposite sides of said port, the outlets opening into the chamber along lines extending in the directions of movement of the piston away from said port in opposite directions to effect progressive checking, an abutment located in the por-' tion of the chamber diametrically opposite the port, and means for effecting relative rotary movement of the piston and the casing.

6. In a hydraulic check mechanism, a casing formed with a cylindrical reservoir for a checking liquid, a cylindrical piston chamber located.

in the reservoir and spaced from the cylindrical Wall thereof, a piston having an oscillating moveing into the chamber along lines extending in 1 the directions of movement, of the piston away from said port in opposite directions to effect progressive checking, an abutment located in the portion of the chamber diametrically opposite the port, and means operable at will for closing the outlets more or less to vary the progressive checking action.

ERNEST DAVIS, 

